package com.pubinfo.passbook.common.utils;

import lombok.SneakyThrows;

import java.security.MessageDigest;

/**
 * @author zhouch
 */
public class MD5 {
  private static MessageDigest md5 = null;
  
  @SneakyThrows
  public static String digest(String msg) {
    
    if (null == md5) {
      md5 = MessageDigest.getInstance("MD5");
    }
    
    byte[] byteArray = null;
    byteArray = msg.getBytes();
    byte[] md5Bytes = md5.digest(byteArray);
    StringBuffer hexValue = new StringBuffer();
    
    for (int i = 0; i < md5Bytes.length; i++) {
      int val = ((int) md5Bytes[i]) & 0xff;
      if (val < 16) {
        hexValue.append("0");
      }
      hexValue.append(Integer.toHexString(val));
    }
    
    return hexValue.toString();
    
  }
  
}
